Proteins

• The primary structure of a protein is the linear sequence of amino acids.
• The secondary structure of a protein involves the particular coiling or folding of the polypeptide chain into two distinct shapes, the alpha helix or beta sheet.
• Tertiary structure refers to the folding that results in the final three-dimensional shape of the polypeptide.
• Proteins that are composed of more than one polypeptide chain have quaternary structure.